Steam-generator.



STEAM GENERATOR.

(Application filed Mar. 18, 1901.)

4 shans-sheet (No Model.)

fl a U ll MUAHHH lll No. &80,593. Patented Aug. 3, eo.

' w. HOBNSBY & D. ROBERTS.

STEAM GENEBATOR.

(Application filed Mar. 18, 1901.

4 Sheets-Sheet 2.

I (No Model.)

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O OOOOO M ,w 'I A &Law 'V 1" QMW No. 680,593. Patented Aug. !3. 1904..W. HORNSBY &. D. ROBERTS.

'STEAM GENERATOR.

(Appcation filed Mar. 18, 1901.)

No Model.) v

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m: NORRIS perms coi mo'rum No. 680,593.- Patented Aug. !3, !901.

W. HORNSBY & D. ROBERTS. STEAM'GENERATOB.

(Application fllad Mar. 18, 1901.)

4 Sheets-Sheet 4.

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PATENT OFFICE.

WILLIAM HORNSBY AND DAVID ROBERTS, OF GRANTHAM, ENGLAND.

STEAM-G EN ERATO R.

SPECIFICATION forming part of Letters Patent No. 680,593, dated August13, 1901.

' Application filed March 18, 1901.

To all w/wm 't may concerns Be it known that we, WILLIAM HORNSBY andDAVID ROBERTS, subjects of the King of' Great Britain, residingatSpittlegate Iron lVorks, Grantham, England, have invented new and usefulImprovements in Stean-Generators, of which the following is aspecification.

This invention relates to improvements in steam-generators, and has forits object to insure the development of more power upon a givenfloor-space and also greater efficiency than is possible with .steam-generators as leretofore usually made.

The invention is applicable to steam-generators of the water-tube type,as constructed with a series of straight, inclined, or curved tubes overa furnace, either or both ends being suitably connected to a steam andwater drum or drums.

According to this in vention We arrange one or more furnaces, each' withits own ash-pit, below the usual furnace and ash-pit, the gases from thelower furnace or furnaces passing into and through thecombustion-chamber and thence over the heating-surface of the boiler. Toobtain more heating-surface, we make the headers with extra rows oftubes in height or depth, and we may also arrange over the lower furnaceor furnaces one or more rows of tubes, which may be connected to theusual slab or sectioual headers so as to form part of the boiler. Onsome of the tubes over the furnace We place fire-clay tiles orspecially-shaped fire-clay bricks, so' as to cause the gases to travelover the bridge-wall of the furuace into the oombustion chamber orchambers before passing upward over the heating-surface of the boiler. Aseries of suitable battles is arranged so as to cause the gases ofcombustion to circulate over the whole of the heatingsurface (andsuperheater, if used) before passing to the chimney.

When boilers such as those previously described are fitted withsuperheaters, instead of placing the su perheater in the usualposition-7l. e., inmediately under the steamdrum and above the tubes andusing one stack of tubes -we divide the tubes into two stacks and placethe superheater between them, so that it will be subjected to the actionof hot- Serial No. 51,716. No model.)

ter gases of combustion than it would be when placed in the ordinaryposition.

In .the accompanying drawings, Figure 1 is a sectioual elevation of astean-generator having our improvements applcd thereto. Fig. 2 is across-section on the line 2 2, Fig. 1.

Fig. 3 is a cross-section on the line 3 3, Fig. '1.

Fg. 4 is a front elevation of the generator. Fig. 5 is a View, similarto Fig. 1, of a generator having a superheater arranged according, tothe invention. Fig. (5 is a crosssection on the line 6 6, Fig. 5. Fig. 7is a cross-section on the line 7 7, Fig. 5, and Fg. 8 is a frontelevation of the generator.

Referring first to the arrangement illustrated in Figs. l to 4 of thedrawings, a is the upper furnace of the generator, and b is its ash-pit.-c is the lower f urnace, and d the ashpit thereof, said furnaces havingin rear there- .both furnaces to cause the gases from both upper andlower furnaces to pass over the -bridges and into and. through thecombustioncham ber and thence over the heating-surface of'the boiler inthe usual manner. fis the steam and water drum, g g are the Watertubesover the upper furnace a, and h and 'i the front and back headers,respectively, to which the said tubes are connected. j j are the tubesarranged between the upper and lower furnaces. k is the front header andZ the back header and mud-drum, to which the said tubes are connected.The header h is con- 11 ected to the steam and water drnmfby the nipplesm m and to the header k by the tubes nn, while the header and mud-drumlare connected to the header i by the tubes o o and to the steam andwater drum f by the tubesp 19.

Referring now to the arrangement shown in Figs. 5 to 8, the same lettersof reference designate the same parts asin Figs. l to 4, and thearrangement of the furnaces, ashpits, combustion-chambers,stoking-levels, and boiler generally is also the same, with theeXception that the headers h and and tubes g are divided into twostacks, the divided headers being connected by the nipples q q and r r,respectively. s is the su- IOO perheater, placed between the stacks oftubes g. t is the steam-inlet and u the steam-outlet fron thesnperheater. o and 'w are stopvalves, and w is the steam-supply pipefrom the generator. By regnlating the stop-valves 1; and w eithersatnrated, superheated, or mixed steam passes into the said supply-pipea). By arranging the superheater between the divided stack of tubes itwill be subjected to the action of hotter gases than is the case when itis placed immediately under the steam and water drum in the usualmanner.

Having now particularly described and asce'tained the nature of our saidinvention and in what manner the same is to be performed, we declarethat what we claim is- 1. In a steam-generator, the combination with twofnrnaces arranged one above the other and a common combnstion-chambercommunicating with both fnrnaces, of aboiler comprising a steam-drum, awater-tube section located above the upper furnace and connected withthe steam-drun and a watertube section interposed between said furnaces,connections extending therefrom to the upper water-tube section fromsaid lower tube-section directly to the steam-drum, substantially asdescribed.

2. In a steam-generator, the conbination with two furnaces arranged oneabove the other and a common combustion-chamber communicating with bothfurnaces, and a deflecting-plate above each furnace extending from thefront thereof to the combustionchamber, of a boiler comprising astean-drum, a water-tube section located above the upper fu rnace andconnected with the steam-drum, a water-tube section located above thelower furnace, connections from said lower watertnbe section to theupper water-tube section and' direct connections from said lowerwaler-tube section to the steam-drnm, said water-tube sections extending'earwardly into and over the combustion-chamber, substantially asdescribed. t

3. In a stean-generator, the combination with two fnrnaces, arranged oneabove the other and a common combustion-chamber commnnicating with bothfurnaces, of a boiler comprising a steam-drum an upper watertube sectionlocated above the npper fnrnace, said section being divided horizont-anyinto two parts and connected with the steam-drnm, asuperheater arrangedbetween the two parts of the u pper water-tu be section and connectedWith the steam-drum, a lower Water-tu be section interposed between thetwo furnaces, connections extending therefrom to the npper water-tubesections and direct connections eXtending from said lower water-tubesection to the steam-drnm, substantially as described.

4:. In a'steam-generator, the combination with a fnrnace andcombustion-chamber, of a boiler comprising a steam-drum, a watertubesection formed in two horizontal parts and connected to the steam-drumand a superheater interposed between the parts of the water-tube sectionand connected with' the steam-drum, snbstantially as described.

VVILLIAM HORNSBY. DAVID ROBERTS.

Witnesses:

SAMUEL WILLIAM PAYNE, ROBERT ABLEWHITE BROWN.

